<!DOCTYPE html>
<html>
	<head lang="en">
		<meta charset="UTF-8">
		<title>网易邮箱页面布局</title>
		<style>
			header,section,footer,aside{
				height:200px;
				width: 500px;
				border:4px solid aqua;
			}
		</style>
	</head>
	<body>
		<header> 
		<h2>网页头部</h2>
		</header>
		<section>网页主体部分</section>
		<footer>网页底部</footer>
	</body>
</html>
